I assume you did he work. Grow them too, or? Anything special for storage, oxygen absorber, or???
I LOVE dehydrating. It takes up much less room than canning, is lightweight, easy to carry. I like to make a "soup mix" that has onions, peppers, squash, green beans, kale, sweet potato, carrots, and tomatoes. Throw some of that in a pot of water with a bit of lentils and quinoa, and you have a real hearty soup. Yum. for storage intended for more than a year, I throw in an O2 absorber before sealing.
lid sucker attachment thing - love it!
I do that with mushrooms instead as the onions will last till summer in the root cellar like the garlic potatoes carrots and such.
Usually hen of the woods or sulfur/chicken mushrooms. They rehydrate nice with other raw veggies and you don't need to boil off any water.
I would use those onions for backpacking or for a SHTF mixture with rice/pasta/beans and some spices.
P.S 1/2 gal jar?